ОТКРЫТЫЙ РЕЗОНАТОР С ОТРЕЗКОМ ПРЯМОУГОЛЬНОГО ВОЛНОВОДА

Abstract

A hemispherical open resonator with a rectangular waveguide section mounted at the center of the open resonator plane mirror is considered. A theoretical analysis has been made to find out that the excitation efficiency of the waveguide wave TE 10 excited by the open resonator oscillation TEM 0 0 q can reach 90 % for some certain cross-sectional dimensions of the waveguide. To this end, a hemispherical open resonator with a superdimensional rectangular waveguide section was experimentally studied in the 4 mm wave region. The cross-sectional dimensions were chosen under the condition of obtaining maximum excitation efficiency of the fundamental waveguide wave. The study shows that the excitation of the fundamental mode alone holds in this resonant system across the whole tuning range. Comparison of reflection coefficients of a waveguide-loaded resonator either with or without a reflecting diffraction grating at the waveguide section bottom indicates that both of the electrodynamic systems have nearly equal losses. Key words: excitation efficiency, open resonator, overmoded rectangular waveguide, diffraction grating Manuscript submitted 29.04.2014 Radio phys. radio astron. 2014, 19(3): 249-257 REFERENCES 1. MIROSHNICHENKO, V. S., SENKEVICH, E. B., PIVOVAROVA, A. G., and YUDINTSEV, D. V., 2010. Excitation of oscillations in a generator of diffraction radiation with multistage space interaction. Izv. vuzov . Radiofizika. vol. 53, no. 3, pp. 200–209 (in Russian). 2. RUSIN, F. S. and BOGOMOLOV, G. D., 1968. Orotron as millimeter-wave generator. 3. SHESTOPALOV, V. P. (ed.), VERTII, A. A., and ERMAK, G. P., 1991. Diffraction radiation oscillators . Kyiv: Naukova Dumka Publ. (in Russian). 4. MYASIN, E. A., EVDOKIMOV, V. V., and IL'IN A. Yu., 2011. Orotron with double periodic structure range 140 ... 300 GHz. Radiotekhnika i Elektronika , vol. 56, no. 4, pp. 454–467 (in Russian). 5. MIROSHNICHENKO, V. S., DUDKA, V. G., YUDINTSEV, D. V., 2010. Shaping of Extended Fields in the Open Resonator with Trapezoidal Mirrors. Radiophysics and Electronics , vol. 15, no. 2. pp. 16–21 (in Russian). 6. SHESTOPALOV, V. P., 1976. Diffraction electronics . Kharkov: Kharkiv University Publishers. 7.KUZ'MICHEV, I. K. and HLOPOV, G. I. 1989. Consistent stimulation Quasi-optical Open Resonator. In: Quasi-optical equipment in the millimeter and submillimeter waves . Kharkiv, Ukraine: IRENASU Publ. pp. 149–156 (in Russian). 8. BURSHTEIN, E. L., 1958. On the power received by the antenna in the fall at her non-planar wave. Radiotekhnika I Elektronika , vol. 3, no. 2, pp. 186–189 (in Russian). 9. KAY, A. F., 1960.Near-field gain of aperture antennas. IEE Trans. Antennas Propag. vol. 8, no. 6, pp. 586–593. DOI: https://doi.org/10.1109/TAP.1960.1144905 10. KUZMICHEV, I. K., 2009. Exitation efficiency of quasioptical resonancesystems. Telecommunications and Radio Engineering. vol. 68, no. 1, pp. 49–63. DOI:10.1615/TelecomRadEng.v68.i1.30 11. KUHN, R., 1967. Microwave antenna. Leningrad. USSR: Sudostroenie Publ. (in Russian). 12. SUHU, R. F., 1963. Non confocal multi-wave resonators for quantum-mechanical oscillator. Proc. IEEE , vol. 51, no.1, pp. 106–111 (in Russian). 13. SHESTOPALOV, V. P., 1985. Physical basis for millimeter- and submillimeter-wave equipmen . Vol. 2 (Sources. Element base. Radio Systems), Kyiv: Naukova dumka Publ. (in Russian). 14. FRAIT, Z. and PATTON, C. E., 1980. Simple analytic method formicrowave cavity Q determination. Rev. Sci. Instrum . vol. 51, no. 8, pp. 1092–1094. DOI: https://doi.org/10.1063/1.1136368 15. VALITOV, R. A. (ed.), DYUBKO, S. P., and KAMYSHAN, V. V., 1969. Technique submillimeter waves . Moskow: Sov. radio Publ. (in Russian). 16. ANDROSOV, V. P. and KUZ'MICHEV, I. K., 1987. The influence of internal irregularities open cavity to communicate with its oscillation waveguide lines . Kharkiv, Ukraine: IRENASU Publ. (in Russian). 17. TARASOV, L, V., 1981. The physics of the processes in generators of coherent optical radiation . Moskow: Rasio i Svyaz' Publ. (in Russian).